The present invention provides a compound of Formula (I): wherein R1, R2, R3 and R4 are each independently selected from a hydrogen atom, an optionally substituted C1-C6 alkyl group, an optionally substituted C7-C14 aralkyl group and —C(═O)Rx; Rx represents an optionally substituted C1-C6 alkyl group, an optionally substituted aryl group, an optionally substituted heteroaryl group, an optionally substituted C1-C6 alkoxy group or —NReRf; Ar1 represents an optionally substituted aromatic carbocyclic ring or an optionally mono-substituted aromatic heterocyclic ring; Q represents —(CH2)m-(L)p- or -(L)p-(CH2)m—; m represents an integer selected from 0 to 2, n represents an integer selected from 1 and 2, and p represents an integer selected from 0 and 1; L represents —O—, —S— or —NR5—; and A represents an optionally substituted aryl group or an optionally substituted heteroaryl group, a prodrug thereof and a pharmaceutically acceptable salt thereof, as well as a pharmaceutical preparation or pharmaceutical composition comprising such a compound.